Why do alternators have a one-way clutch?
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An Overrunning Alternator Pulley (OAP) has a one-way clutch mechanism inside the hub that allows the belt to turn the alternator in one direction, but allows the alternator to free-wheel and spin at its own speed when the engine suddenly decelerates.
What does a decoupler pulley do?
What does an OAD™ pulley do? An OVERRUNNING ALTERNATOR DECOUPLER™ pulley helps “synchronize” the belt drive system for improved engine efficiency, reduced Noise/Vibration/Harshness (NVH) and increased component life. When an engine accelerates, the alternator’s mass creates resistance against the belt.
What is a clutched pulley?
Many vehicles have pulley clutches to allow some of the belt-driven components to freewheel when not in use. The clutch functions by engaging when the accessory is needed and disengaging when it isn’t.
Should alternator pulley spin freely both ways?
It should turn quite easily but more important is it should be smooth. Very smooth. New bearings will sometimes feel a bit stiff and not turn freely because of the new seals and new grease that is in them. However that is ok as long as they are smooth.
Do you need clutch pulley on alternator?
Most modern vehicles have clutched or so called one-way or decoupler pulleys. Proper operation of these pulleys is vital to alternator health and the health of other components, especially the serpentine belt tensioner.
What is solid pulley?
Solid pulley is extensively used in many industries. And also this Solid pulley is available in a huge range in the market. Its peculiarity is that also usable for the residence applications. Solid pulleys are best to use as it has long stability for long time period.
Why do superchargers have a clutch?
By way of example, a clutch can allow a smaller supercharger to be used to provide boost at low engine speeds and disengaged at high engine speeds to prevent overspeeding the supercharger.
How tight should an alternator pulley be?
You should be able to push the belt in the middle of the pulley and the alternator about 1/2 inch.
Should an alternator spin?
An alternator has a normal range of operation. Most alternators need to spin at about 2,400 rpm at idle, have their maximum output above 6,000 rpm, and should never exceed 18,000 rpm.
What is a one-way clutch pulley?
Some popular names associated with this style of pulley include, overrunning alternator pulley (OAP), clutch pulley, freewheeling pulley, Reactiv™ decou- pler pulley, and of course the one-way clutch. It is simply an alternator pulley with a one-way clutch mechanism inside.
How does a clutch pulley work?
The pulley will rotate freely in one direc- tion and immediately lock in the other. This type of clutch pulley allows the alternator rotor to coast to a stop when shutting down the engine or any other time the engine rpm decelerates quickly (transmission shifting).
What is the best one-way clutch for a bicycle?
The HF, HFL and FRAX series of drawn cup roller clutches are particularly popular in bicycle applications. HF one-way clutches have an extremely compact design but have no bearing supports and so can only transmit torques. HFL series one-way clutches can also support radial forces due to the integral plain or rolling bearings.
How can a one-way clutch be fixed into position?
The outer circumference of the outer ring can be formed into a special shape. Then, by simply inserting the one-way clutch into the housing whose inner surface conforms to the outer surface of the outer ring, the one-way clutch is fixed into position to prevent undesirable rotation. [Explanation]